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Heavy Electron Superconductivity: From 1K to 90K to ?
Abstract Heavy electron systems are intermetallic compounds containing elements with unfilled f-electron shells, such as U or Ce, which at room temperature and above behave like a weakly interacting collection of f-electron moments and conduction electrons with ordinary masses, while at low temperatures the conduction electron specific heat becomes typically some hundred times larger than that found in most metals. (1) These highly correlated low temperature states display remarkable behavior whether the system remains normal down to the lowest temperature measured, becomes antiferromagnetic, or becomes superconducting. While in ordinary metallic superconductors a dilute concentration of magnetic impurities destroys superconductivity, in heavy electron systems superconductivity and antiferromagnetism can coexist; a transition to either ordered state may be followed by a second transition to a phase containing both states. Thus in both UPt3 and URu2Si2 one finds on lowering the temperature that an antiferromagnetic transition is followed by a transition to the superconducting state, while in U0.97 Th0.03 Be13 order of the transitions is reversed.
Heavy Electron Superconductivity: From 1K to 90K to ?
Abstract Heavy electron systems are intermetallic compounds containing elements with unfilled f-electron shells, such as U or Ce, which at room temperature and above behave like a weakly interacting collection of f-electron moments and conduction electrons with ordinary masses, while at low temperatures the conduction electron specific heat becomes typically some hundred times larger than that found in most metals. (1) These highly correlated low temperature states display remarkable behavior whether the system remains normal down to the lowest temperature measured, becomes antiferromagnetic, or becomes superconducting. While in ordinary metallic superconductors a dilute concentration of magnetic impurities destroys superconductivity, in heavy electron systems superconductivity and antiferromagnetism can coexist; a transition to either ordered state may be followed by a second transition to a phase containing both states. Thus in both UPt3 and URu2Si2 one finds on lowering the temperature that an antiferromagnetic transition is followed by a transition to the superconducting state, while in U0.97 Th0.03 Be13 order of the transitions is reversed.
Heavy Electron Superconductivity: From 1K to 90K to ?
Pethick, C. J. (author) / Pines, David (author)
Novel Superconductivity ; 201-214
1987-01-01
14 pages
Article/Chapter (Book)
Electronic Resource
English
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